Process of manufacturing sheet-glass.



PATENTED APR. 14E, 1903 vP. T. SIEVERT. rnocsss OF MANUFACTURING SHEET GLASS.

APPLIUATION FILED DEG. 26, 1901 N0 MODEL.

, D; STATES PAUL Timon-on sinvnn'r,

PATENT OFFIcE.

o r' can s N, GERM A NY.

PROCESIS o|= MANUFACTURING SHEET-GLASS.

SPECIFICATION forming part of Letters Patent'No. 725,497, dated April 14., 1903.

' Application filed December 26,1901 Serialllo. 87,201. (No specimens.) I

Manufacturing Sheet-Glass, of which the following is a specification. t

The improvement which constitutes the present inventionis based upon the process described in my United States Patents Nos. 651,059 and 641,048, according to which ahot liquid layer of glass is spread out'on the 'perforated surfaceof a-hollow plate, upon which it is held by a frame while it is subjected to the action of an elastic pressure'medium for the purpose of expanding the parto'f the said hot liquid glass layer included within the said frame. The object of the present invention is to adapt the said process to the eco'nomical'manufacture of sheets of glass withperfect fire-' polish on both sides.v

-In carrying out'my invention I proceed in the following manner: The hot layer ofglas's is spread out on a hollow'plate provided with holes in its upper surface, said hollow plate being arranged to be turned upside down and having connections for an elastic. pressure. medium to be led into said hollow plate. The spread-out hot layer of glass having had its surface smoothed down in any convenient manner and having had'its rim confined to the plate by a .su-itableframe, the plateis turned upside down,and -theihot glass within the frame may be allowed to sag or sink and is" afterward, by means of the elastic pressure medium, caused to expand to a hollow ball-like body, which is then inclosed within a skeleton form or mold constructed ofsharp-edged fillets, which form together the edges'of a cube or prism.

glass body within the said skeleton form or in the annexed drawings;

By continually expanding this body, constituting its bottom and sides, after having been separated'at the edges-orcow 'ners formed by the edge fillets of the skeleton form or mold will'deliver glass panels, which are'afterward flattened into sheets.-

'fIThe apparatus for carrying out the above process of manufacturing sheet-glass is shown Figure 1 is an upright view or the complete apparatus, partly in section, showing the hot glass in several stages of expanding, the skeleton form or mold being'left open during such expansion] Fig-2 is a plan 'corresp'onding with Fig.1, partly in section, showingthe blown-glass body within theclosed skeleton form or mold composed of fillets, the upper hollow plate being removed Fig. 2., a horizontal section corresponding with Fig. 4, but

on' a larger scale, of'one'ofthe corners'of the skeleton form-and of the blown-gl'assbody "therein; Fig. 3, an upright view of the-aprparatus partly in section and with theclosed skeleton form or mold including the blown hollow glass body. Fig. 4 is a-plan'ofi Fig. 3, partly'in section,showing the'blown-glass body within the skeleton form'or mold, the

upper hollow plate being removed;lFig. 4, a horizontal section corresponding with Fig. 4,

buton a larger scale, of one of, the corners of saidform-and the glass body therein. Fig.

"5 is a perspectiveview of the glass body which has been blownout within a filleted skeleton form ormold, but freed from or taken out of such skeleton form or mold. t

Referring to Fig. l, arepresents the uprights erected on the base-plate c and carry ing the boxes at, which-receive the trunnions b b of the hollow, plate I), with perforated surface upon which the hot layer of glass is deposited. Thev trunnion b is hollowand constitutes the conduit through which the compressed air or other pressure medium enters.

the cavity of saidplate. c'is the frame, of suitable shape, by whichthe glass layer is held on said perforated surface. The plate and .frame are shown upside down.

j The base-plate c has asuitable central opening'around which is arranged the form or mold composedof sharp-edged fillets d,hinged tosaid plate, so that they may be set upright, as indicated by the arrows in Fig. 1, and

may be kept in-this upright" position by con- Ice necting them in any suitable manner to the upper frame e. The sharp-edged fillets d of the form or mold by which the corners of the hollow bodyfare formed may be spaced to make double edges, as shown in Figs. 2 and 2, or may be arranged to come close together to form a single edge, as shown at d in Figs. 4 and 4:.

When the skeleton form or mold repre sented in Figs. 1 and 2 is closed, its fillets d presenting double edges, will form at the cor ners slits within which, as shown in Figs. 2 2, and 5, the glass at the corners of the hollow glass body will bulge out, the so-bulgedout parts it forming the separating-lines at which the body maybe divided into sheets.

When the skeleton form or mold represented in Figs. 4 and 4" is closed, its sharp fillets d present together single edges which.

form corners at which the glass will be bulged inward during expansion, the so-bnlged-in parts it forming the separating-lines on which to divide the body into sheets. The fillets d d. must be so hinged that if they are closed to form the skeleton form or mold they may easily be tn rned away from thebulged-out or bulged-in part of the glass ,body when the hot glass has solidified so farthat the hollow body may be removed from the plate I) or from the shaping-frame e. a v

It is indicated in Fig. 1 how the sagging or sinking and the blowing of the glass bodyf in the diiferent stagesff f is proceeded with until the closing of the skeleton form or mold may take place, as shown in Fig. 3, whereupon by the continued blowing out the ball-like body will meet against the cornerfillets, thereby according to Figs. 2, 2, and

5 bulging out at the corners n and according to Figs. 3, 4, and 4 bulging in at the corners it, the intermediate portions m in both cases being expanded outwardly beyond the fillets in the form of panels m until the admission of the elastic pressure medium is shut off. The body now has the form of a hollow cube or prism with bulged-out sides.

After sufficient solidification of the glass the upright fillets cl are turned down, and the glass body is removed from the shaping-frame e. The body may now be at once divided at its corners n or n by cutting or by any means known to glass-workers into panels m, which have only to be flattened by any of the means known to glass-blowers to produce plates retaining on both sides their perfect fire-polish.

What I claim as my invention is-- The process of manufacturing glass sheets i ber, 1901. PAUL TI-IEODOR SIEVERT.

\Vitnesses:

HERNANDO DE So'ro,

PAUL AREAS. 

